Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22202
Title: Novel feast-fast technique for filamentous foam control in the activated sludge process - Introducing a new foam-measurement method
Authors: Chua, H
Lo, WH 
Yu, PHF
Sin, SN
Zhao, YG
Tan, KN
Keywords: Activated sludge
F/M ratio
Feast-fast operation
Filamentous microorganisms
Foam measurement
Issue Date: 2000
Publisher: Int Water Assoc, United Kingdom
Source: Water science and technology, 2000, v. 42, no. 3-4, p. 95-102 How to cite?
Journal: Water Science and Technology 
Abstract: Overgrowth of filamentous Nacardia spp. in the activated sludge microbial ecosystem was previously identified as the cause of foaming problems in Hong Kong. In this work, the specific growth rate of N. amarae was found to be significantly higher than that of non-filamentous bacteria under food-to-microorganism (F/M) ratios lower than 0.5 mgBOD/mgMLSS-day, and was used as the basis for the development of a novel Feast-Fast Operation (FFO) for the prevention and control of foaming problems. The F/M ratio in the 'feasting' aeration unit was 0.8 mgBOD/mgMLSS-day while that in the 'fasting' aeration unit was 0.2 mgBOD/mgMLSS-day, resulting in an overall process F/M ratio that remained within the normal range, while avoided prolonged exposure of the sludge ecosystem to an F/M ratio below 0.5 mgBOD/mgMLSS-day. The FFO suppressed filamentous overgrowth and foaming without adversely affecting the organic treatment efficiency of the modified process. A new and convenient measurement method was developed for quantifying the degree of foaming and foam stability in activated sludge.Overgrowth of filamentous Nocardia spp. in the activated sludge microbial ecosystem was previously identified as the cause of foaming problems in Hong Kong. In this work, the specific growth rate of N. amarae was found to be significantly higher than that of non-filamentous bacteria under food-to-microorganism (F/M) ratios lower than 0.5 mgBOD/mgMLSS-day, and was used as the basis for the development of a novel Feast-Fast Operation (FFO) for the prevention and control of foaming problems. The F/M ratio in the 'feasting' aeration unit was 0.8 mgBOD/mgMLSS-day while that in the 'fasting' aeration unit was 0.2 mgBOD/mgMLSS-day, resulting in an overall process F/M ratio that remained within the normal range, while avoided prolonged exposure of the sludge ecosystem to an F/M ratio below 0.5 mgBOD/mgMLSS-day. The FFO suppressed filamentous overgrowth and foaming without adversely affecting the organic treatment efficiency of the modified process. A new and convenient measurement method was developed for quantifying the degree of foaming and foam stability in activated sludge.
Description: Water Quality Management in Asia (Asian Waterqual'99), Taipei, Taiwan, 18-20 October 1999
URI: http://hdl.handle.net/10397/22202
ISSN: 0273-1223
Appears in Collections:Conference Paper

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